INT 31 P - CauseWay - "GetMemLinear32" - ALLOCATE MEMORY WITHOUT SELECTOR
AX = FF11h
ECX = size of block in bytes
Return: CF clear if successful
ESI = linear address of allocated block
CF set on error
Note: this function may return addresses above 16M
SeeAlso: AX=FF0Ch,AX=FF10h,AX=FF13h,AX=FF14h